 <template>
 <div>
      <QrStream
        :style="scannerStyle"
        @decode="handleDecode"
        @init="handleInit"
        @error="handleError"
      >
        <template v-if="showCloseButton">
          <div class="qr-scanner-container">
          <!-- <div class="close-view dis-center" @click="closeScanner">X</div> -->
            <div @click="closeScanner">关闭</div>
            <div class="qr-scanner">
              <div class="box">
                <div class="line"></div>
                <div class="angle"></div>
              </div>
            </div>
          </div>
        </template>
      </QrStream>
    </div>
  </template>
  
  <script setup>
  import { ref, defineExpose } from 'vue'
  import { QrStream } from 'vue3-qr-reader'
  
  const emit = defineEmits(['decode','close'])
  
  const scannerStyle = {
    position: 'fixed',
    top: 0,
    left: 0,
    width: '100vw',
    height: '100vh',
    zIndex: 9999,
  }
  
  const showCloseButton = ref(false)
  
  const qrcodeData = ref(null)
  
  const handleDecode = (data) => {
    console.log('Decoded data:', data)
    emit('decode', data)
    qrcodeData.value = data
  }
  
  const closeScanner = () => {
    emit('close')
  }
  
  const handleInit = async (promise) => {
    try {
      const { capabilities } = await promise
      console.log('Camera capabilities:', capabilities)
      showCloseButton.value = true
    } catch (error) {
      handleError(error)
      
    }
  }
  
  const handleError = (error) => {
    const errorMessages = {
      NotAllowedError: '您需要授予相机访问权限',
      NotFoundError: '这个设备上没有摄像头',
      NotSupportedError: '所需的安全上下文(HTTPS、本地主机)',
      NotReadableError: '相机被占用',
      OverconstrainedError: '安装摄像头不合适',
      StreamApiNotSupportedError: '此浏览器不支持流API',
      InsecureContextError: '仅允许在安全上下文中访问摄像机。使用HTTPS或本地主机，而不是HTTP。',
    }
  
    const message = errorMessages[error.name] || 'ERROR: 摄像头错误'
    // message.error(message)
    console.error(message)
  }
  
  defineExpose({ qrcodeData })
  </script>
  
  <style scoped lang="scss">
  .qr-scanner-container {
    position: relative;
    width: 100%;
    height: 100%;
  
    .close-view {
        position: absolute;
        top: 20px;
        right: 20px;
        font-size: 40px;
        color: #FFFFFF;
        z-index: 1000000;
    }
  }
  
  .qr-scanner {
    background-image: linear-gradient(
        0deg,
        transparent 24%,
        rgba(32, 255, 77, 0.1) 25%,
        rgba(32, 255, 77, 0.1) 26%,
        transparent 27%,
        transparent 74%,
        rgba(32, 255, 77, 0.1) 75%,
        rgba(32, 255, 77, 0.1) 76%,
        transparent 77%,
        transparent
      ),
      linear-gradient(
        90deg,
        transparent 24%,
        rgba(32, 255, 77, 0.1) 25%,
        rgba(32, 255, 77, 0.1) 26%,
        transparent 27%,
        transparent 74%,
        rgba(32, 255, 77, 0.1) 75%,
        rgba(32, 255, 77, 0.1) 76%,
        transparent 77%,
        transparent
      );
    background-size: 3rem 3rem;
    background-position: -1rem -1rem;
    width: 100%;
    /* height: 100%; */
    height: 100vh;
    position: relative;
  
    /* */
  }
  
  .qr-scanner .box {
    width: 300%;
    height: 300px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    overflow: hidden;
    border: 0.1rem solid rgba(0, 255, 51, 0.2);
    /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
  }
  
  .qr-scanner .line {
    height: calc(100% - 2px);
    width: 100%;
    background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
    border-bottom: 3px solid #00ff33;
    transform: translateY(-100%);
    animation: radar-beam 2s infinite alternate;
    animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
    animation-delay: 1.4s;
  }
  
  .qr-scanner .box:after,
  .qr-scanner .box:before,
  .qr-scanner .angle:after,
  .qr-scanner .angle:before {
    content: '';
    display: block;
    position: absolute;
    width: 3vw;
    height: 3vw;
  
    border: 0.2rem solid transparent;
  }
  
  .qr-scanner .box:after,
  .qr-scanner .box:before {
    top: 0;
    border-top-color: #00ff33;
  }
  
  .qr-scanner .angle:after,
  .qr-scanner .angle:before {
    bottom: 0;
    border-bottom-color: #00ff33;
  }
  
  .qr-scanner .box:before,
  .qr-scanner .angle:before {
    left: 0;
    border-left-color: #00ff33;
  }
  
  .qr-scanner .box:after,
  .qr-scanner .angle:after {
    right: 0;
    border-right-color: #00ff33;
  }
  
  @keyframes radar-beam {
    0% {
      transform: translateY(-100%);
    }
  
    100% {
      transform: translateY(0);
    }
  }
  </style>